The effect of the cobalt-content on the magnetic properties of iron-based amorphous alloys

• Published in: Journal of magnetism and magnetic materials 2019-05, Vol.477, p.214-219
• Main Authors: Nabiałek, Marcin, Jeż, Bartłomiej, Błoch, Katarzyna, Pietrusiewicz, Paweł, Gondro, Joanna
• Format: Article
• Language: English
• Subjects: Alloys; Amorphous alloys; Amorphous materials; Bulk amorphous materials; Chemical composition; Cobalt; Cobalt base alloys; Coercive field; Coercivity; Curie temperature; Diffraction patterns; Ferrous alloys; Magnetic properties; Metallic glasses; Organic chemistry; Production methods; Rapid-solidification; Suction; X-ray diffraction
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.01.073

•Good soft magnetic properties of alloys based on FeCoB.•The cobalt content affects the Curie temperature and the coercive field value.•Curie temperature is higher for materials produced by suction casting method.•The presence of nanometric grains of the Fe5Y phase (semi-hard) reduces the coercive field value. This paper describes the results of studies carried out on bulk amorphous materials with the chemical compositions: Fe61+xCo10−xY8W1B20 (where x = 0, 1 or 2). The alloy samples were produced in the form of plates with the following dimensions: 10 mm × 5 mm × 0.5 mm. Massive amorphous glass structures were produced by two methods: injection and suction casting. On the basis of the recorded X-ray diffraction patterns, only the disordered phase was identified within the volume of each alloy. The only exception was the alloy with the chemical composition: Fe62Co9Y8W1B20, produced by the injection method, in the volume of which an (insignificant) trace quantity of the Fe5Y phase was registered. The presence of this phase explains the lower value of the coercive field compared to the other alloys. The investigations confirmed the effect of the cobalt content on the coercive field value, and the Curie temperature, of the amorphous alloys. However, the cobalt content was not found to have a significant influence on the saturation of magnetisation. Also, the method of producing the investigated amorphous materials does not seem to have a significant effect on the magnetic properties of the resulting alloys.